Control mechanism for revolving scrapers



July 2, 1 929. THROQP 1,719,247

} CONTROL MECHANISM FOR REVOLVING SCRAPERS Filed Feb. 12, 1927 dilu- QINVENTOR D .R Tin-00 BY (9 .QAAAZ,

ATTORNEY Patented July 2, 1929.

DAMON R. THROOP, OF STOCKTON, CALIFORNIA.

CONTROL MECHANISM FOR REVOLVING SCRAPERS.

Application filed February 12, 1927. Serial No. 167,662.

This invention relates to improvements in control. mechanisms forscraper bowls of the rotary type and particularly representsmodifications of the control arrangement shown in my United StatesLetters Patent No.

1 6211546 dated March 22nd, .1927.

In the previous apparatus the rotation of the bowl was controlled bymeans of aspider or arm member pivoted on the main control lever, thespider normally engaging a stop on the bowl. as well as a step 011 theframe which held the spider and consequently the bowl from rotation. Torelease the spider from the frame stop necessitated raising the lever acertain distance.

The principal object of the present invention is to arrange the stop forthe spider in such a manner that it not only allows of the fullestpossible range of movemcntot the main lever without danger of releasingthe stop, thus permitting the bowl to he tilted to a number of differentpositions without being actually released; but enables the release ofthe bowl when desired to be accomplished more conveniently than bett'oreas no actual raising of the bowl itself has to take place before thestop is released. Also the new controlmeans for the stop can be moreconveniently operated when thescraper is being drawn by a tractor, as isusually the case.

A further object of the invention is to produce a simple and inexpensivedevice and yet one which will be exceedingly efliective for the purposetor which it is designed.

These objects I accomplish by means of: such strluj-ture and relativearrangement of parts as will fully appear by a perusal of the Followingspecification and claims.

In the drawings similar clulracters of reference indicate correspondingparts in the several views:

Fig. l is a side elevation of my improved Pivotally mounted on trunnions3 journaled on. the frames adjacent their rear ends is a howl 4substantially of the well known Fresno type and resting on the ground.This bowl has runner-s5 projecting upwardly from the sides thereof as iscustomary.

Pivoted onto the frame ahead of the trunnions-8 is a lover unitcomprising side arms 6 converging toward each other alileadot the bowlto unite witha single longitudinally extending bar 7. This bar has apull-mechanism 8 of common character mounted thereon which cooperateswith a quadrant 9 fixed on the forward portion of thetrame structure.

Pivoted on the arms 6 adjacent and outwardly of the front of the bowlare spiders 10. Each spider isln'eterably the same as is shown in theprevious application, having a plurality of arms radiating from a commoncenter. Fixed on each runner' 5 and projecting laterally and outwardlytherefrom in concentric relation with the trunnions 3 are stop pins 11which project into the path of rotation of the arms of the spider; onepin normally bearing against .the upper face of one 0]. the armsrearwardly of its pivot. Rotation of the spidersis normally prevented bymeans of other pins 12, each of which bears against the upper face outthe other spider arm ahead of the pivot of said spider. These pins arefixed on and project laterally from vertical control arms or levers 13which are p ivotally mounted below the pins on brackets let de iorulingfrom the lever arms (3. The arms 13 are connected at their upper ends bya. cross member 15 to which a forwardly extending pull. cord 16 isattached. It will therefore be seen that the tilting ot the bowl from ascraping to a carrying position will be positively controlled by raisingor lowering the main lever unit. When it is desired to dump the load andcause the bucket to upset it is only necessary to pull the cord 16 fromahead. This moves the pins 12 forwardly until they clear the pull on thecord is released by suitably connected springs as shown at 17.

From the foregoing description it will be claims.

readily seen that I have produced such a device as substantiallyfulfills the objects of the invention as set forth herein.

.vVhile this specification sets forth in .detail the present andpreferred construction of the device, stillin practicesuch deviationsfrom such detail may be resorted to as do not form a departure from thespirit of the invention, as defined by the appended Having thusdescribed my invention what I claim as new and useful and desire tosecure by Letters Patent is:

1. A scraper comprising a frame, a bowl pivoted thereon and resting onthe ground, a pin projecting late "ally from the bowl in oll'setrelation to the pivot thereof, a. lever member pivoted on the frame,arms fixed relative to each other radiating from a common center andpivoted on the lever, one of said arms being disposed to be engaged bythe pin, astop'member mounted in connection with the'lever to engage theother arm,

and means for withdrawing the stop clear of said arm at will.

2. A scraper comprisinga frame, a bowl pivoted thereon and resting onthe ground, a pin projecting laterally from the bowl in effect relationto the pivot thereof, a lever member pivoted on the frame, arms fixedrelative to each other radiating from a common center and pivoted on thelever, one of said arms being disposed to be engaged by the pin, anotherlever pivoted onto the first named lever, and a stop projectinglaterally from said other lever to be engaged by the other arm, andmeans for moving said other lever; the latter being arranged relative tothe arm to cause such movement to draw the stop clear of the path ofmovement of said arm. I

' 3..A scrapercomprising a frame, a bowl pivoted thereon and resting onthe ground, a pin projecting laterally from the bowl in oflset relationto the pivot thereof, a lever member pivoted on the frame, arms fixedrelative to each other radiating from a common center and pivoted on thelever, one of said arms being disposed to be engaged by the pin, anotherlever pivoted onto the first named lever, and projecting substantiallyat right angles to an edge face of the other arm, a stop projectinglaterally from said other lever to overhang and be engaged by saidarm-face, and means for moving said other lever to move the stoplengthwise of and clear of said arm.

4. A sc'aper comprising a frame, a bowl pivoted thereon, a pinprojecting laterally from the bowl in ollset relation to the pivotthereof, a lever pivoted on the frame, a releasable stop member carriedby the lever and an instrumentality carried by the lever and'normallyengaged by the pln and the stop to keep the bowl from being rotated.

5. A structure as in claim 4;, and means whereby when the stop is\vitl'idrawn from engagement with such instrumentality the same willmove clear of the pin and allow the bowl to be rotated.

6. A scraper comprising a frame, a bowl pivoted thereon, a pinprojecting laterally from the bowl in offset relation to the pivotthereof, a lever pivoted on the frame, a releasable stop member carriedby the lever, unitary arms mounted on the lever and engaging the stopand pin respectively, means to release the stop from engagement with onearm, and means whereby the other arm will then move clear of the pin toallow the bowl to be rotated.

In testimony whereof I aflix my signature.

DAMON R. THROOP.

